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Finding the Fourth Proportional to 261,646.40, 392,615.40 and 111,861.20

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Solution

The fourth proportional to 261,646.40, 392,615.40 and 111,861.20 is: 167,854.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,646.40 : 392,615.40 = 111,861.20 : x
  2. Step 2: Convert to fraction form
    261,646.40/392,615.40 = 111,861.20/x
  3. Step 3: Cross multiply
    261,646.40x = 392,615.40 × 111,861.20
  4. Step 4: Simplify right side
    261,646.40x = 43,918,429,782.48
  5. Step 5: Solve for x
    x = 43,918,429,782.48/261,646.40
  6. Step 6: Final answer
    x = 167,854.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.